Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c3499e982a4a43…

MALICIOUS

PDF

73.9 KB Created: 2021-06-03 10:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 19c47b037bebe626319a2378175d7323 SHA-1: 56a3f48e3087581d809c23d451c9a6f8fb2212cb SHA-256: d4c3499e982a4a43151939c43a9d6b318a634827e3ff960f81d1b49fe6dc4e5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/pbw?utm_term=print+artist+2003+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5ffecdf0cf8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_6046c58841b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_604ccd0b3059d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144518577/lamivapagavavimesiguzugij.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/58012678039.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/systematic_review_methodology.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/w/file/fetch/144544707/multiplying_and_dividing_powers_of_ten_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6edcc4af-373d-46b2-af18-e385f59649a6/specific_heat_capacity_and_latent_heat_worksheet.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144505434/how_to_enter_service_mode_on_samsung_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c066ab9f-53f4-477b-8c85-ce440092e182/is_twilight_midnight_sun_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876f93a9-7cf4-42f0-9503-2001c02d7188/77934860614.pdfIn PDF document text
    • http://wejojixi.pbworks.com/f/devukavugejekatada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d7965c-cdce-4c79-854d-7a5594e053de/35151011032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1bf371-163f-4116-9f26-912b77d800e4/hp_elitebook_8540w_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b618ff1c-0625-4616-9c5c-645c35f8fdf6/how_to_fold_graco_pack_n_play_playard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1dcc2d-59c0-4713-8ba7-fc15e698f1fd/tintin_in_the_congo_color_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69528e7-423f-4fe3-aa48-fb0f06efe779/gewakajinisasiwuwemesebe.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/92503967831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21350ee-fd11-478d-aa92-cb54b1833153/roblox_music_code_for_bad_guy_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d084f2f-cd9d-4736-9125-8545c989c5b6/7552217130.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144478410/60489941483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b231f38e-b63a-4ecd-8d8c-89e02fb924f9/why_is_my_mobile_hotspot_not_working_on_my_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a670e2-5fb1-4dda-b8b2-e15fce95192d/99940654567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c72940-2844-46a0-b974-329ff9668913/32230688769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357ce44a-101d-419d-a07c-0d4a99e7380b/maxikotetap.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/tecrbe_taktiklerle_paragraf_soru_bankas_tm_zamanlarn_tm_snavlar_iin.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 5432 bytes
SHA-256: 02d370e996d8f0516fbdeed77d2aa4cf4be8172b5b3b025c34e01bb24c2cded6
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 10664 bytes
SHA-256: 37a11662b10f7796c17a53879471980385bb2c3c0be75581823c731324dcc456